They "forgot"? WTF? Stories like this are the reason that I do as much of the work to my bike as possible by myself. If my handlebars fell off while riding twisties or something because some jackass "forgot" to put it together right, I'd own his sorry ass.
I'm not much of a mech myself, but I have to agree with Tommy, I will try to do as much work myself as possible. Most (not all) mech's are ripoffs and untrustworthy. Everytime I've had a new bike, I've bought he service manual for that bike and do 90% of my own work.
One thing you have to realize is that a lot of shops have their "goffers" do all the teardown and build ups. The seasoned mechanics usually only jump in when it comes time to trouble shoot and fix difficult problems.
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